Repair & Maintain
Ensure that your system continues to function at its best. Find how-to guides, videos, FAQs and related services to help you with repair and maintenance of your Grundfos products.
How do I contact Grundfos customer service?
As an installer, you have the choice of ordering Grundfos customer service from your specialist wholesaler or of contacting us directly via phone or contact form.
Please have your customer number ready, should you choose to contact us directly. If you are unsure about whether you have a customer number or not, please send us a copy of your company letterhead.
As a private customer, we ask that you refer to a specialist installation company in your area.
How does a UPS pump behave if the capacity of the capacitor is too low? Can the capacitor be replaced?
The pump is running sluggishly or not at all. This can be remedied by replacing the capacitor.
What does downforce in a submersible pump mean, and what causes it?
Downforce is a downwardly directed force acting on the pump's impeller/shaft unit during operation. Most pumps and motors are designed so that a downforce must always be present during operation. However, downforces that are too high may also lead to problems, if for instance the pump is operating at a duty point with a low flow rate and thus high delivery pressure. In the event of continuous operation in this range, the motor's axial bearing may be damaged. Furthermore, the pump and motor...
What does water hammering mean, and what causes it?
Water hammering is a pressure surge caused by a rapid change in flow velocity in the pipeline. This phenomenon is referred to as "water hammering" because the pressure surges are frequently accompanied by a noise that sounds as if the pipeline were being pounded with a hammer.
In well installations, water hammering generally occurs if a) the non-return valve in the downpipe extending down from the pump is installed more than 9 m above the water level, or b) the non-return valve ...
What is 'lift', and what causes it in submersibles?
‘Lift’ refers to a condition whereby an upwardly directed force acts on the impeller/shaft unit of the pump during operation. This condition can be observed when the pump is pumping more water than what it is rated for, i.e. if the pump is operating far to the right on the curve
However, in normal well applications where a non-return valve is installed, lifting forces generally do not occur. This is because the static liquid column remaining in the pipeline after the pump is turned ...
What is the maximum sand content of pumped water for submersibles?
The maximum sand content of the water may not exceed 50 g/m³. A greater sand content reduces the service life of the pump and increases the risk of pump blockages.
Grundfos Technical Institute
Membership to the Grundfos Technical Institute is free and offers access to hundreds of webinars, virtual courses, and other training resources.
Grundfos Repair means minimized production downtime
When pumps break down,you need them up and running again, fast. At Grundfos, we know pumps better than anyone, and we can help you with any repair need of any pump from any manufacturer.
Prompt and reliable service wherever you are
With Grundfos partners throughout the country, we're never far away. Our friendly and knowledgeable pump experts will make sure you get the solution you need for even the most challenging applications.